it does seem kind of strange that the transmission went out of it with such low miles on the vehicle arent hyundais the cars with mile warranties still it could be ok i have had cars with different transmissions for different reasons and they were fine as long as the replacement tranny is shifting properlynot leaking there shouldnt be a problem take it to a mechanic and have them look it over if the seller is wierded out by your wanting to do this it is not the car for you